Broadband wide-beam antenna and vehicle-mounted millimeter wave radar

Abstract

The utility model discloses a broadband wide beam antenna and a vehicle millimeter wave radar, the antenna comprises a first feed line, a plurality of radiators and a plurality of parasitic radiators, the plurality of radiators are distributed at two sides of the first feed line along the extension direction of the first feed line and are connected with the first feed line, and the parasitic radiators are distributed at two sides of the first feed line along the extension direction of the first feed line. The multiple parasitic radiators are arranged on the first side or the second side of the first feeder line, and each parasitic radiator is located on one side of one radiator on the same side as the parasitic radiator. According to the antenna provided by the utility model, the first feeder line, the plurality of radiators and the plurality of parasitic radiators are arranged on the same plane, so that the manufacturing is convenient, the processing cost is reduced, the shaping is realized by optimizing the number of the radiators, adjusting the length of the first feeder line between two adjacent radiators and the width of the radiators, and using a single antenna, so that the antenna is more compact. The size of the antenna is greatly reduced, and the input amplitude of the radiating body is adjusted by combining the additionally arranged parasitic radiating body, so that the beam direction and the beam width of the antenna are adjusted.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of antenna technology, and in particular to a wide bandwidth beam antenna and a vehicle-mounted millimeter wave radar. Background Art

[0002] With the rapid development of today's social economy and people's daily travel needs, the total number of cars in my country has increased year by year and has reached a relatively high level. With the increase in the number of cars, the number of traffic accidents is also gradually increasing, which has an adverse impact on people's health and property safety. With the development of industrial intelligence, the application of vehicle-mounted radar can help drivers make correct decisions in some emergency situations and avoid traffic accidents. For example: vehicle-mounted radar can realize real-time detection of the distance, speed and position of objects around the car, and can realize auxiliary functions such as blind spot monitoring, lane change assistance, and emergency braking.

[0003] At present, the main technologies of vehicle-mounted radar include ultrasonic, laser, infrared and millimeter wave. Since millimeter wave radar has higher resolution and measurement accuracy, and can work stably in harsh environments such as rain, snow and fog, millimeter wave radar has been widely developed and applied. Compared with 24GHz radar, 77GHz millimeter wave radar has higher measurement accuracy and smaller size, and is the development trend of millimeter wave radar today.

[0004] Antenna is an important part of radar system as the front-end transceiver. At present, the main forms of millimeter wave radar antenna are dielectric integrated waveguide antenna, lens antenna and microstrip patch antenna. Microstrip patch antenna has the advantages of low profile, light weight and low cost, so it is widely used.

[0005] Automotive millimeter-wave angle radar is generally used for distance and angle measurement at the rear and side of the car. It can be used to detect moving targets within a short range at the side and rear. This requires the antenna to have a wider beam under a certain gain. This large-angle monitoring can prevent vehicles from colliding on the road and can largely avoid traffic accidents. Usually, the vehicle-mounted millimeter-wave radar antenna needs to have a beam coverage range of 120 degrees or even 150 degrees and have a higher gain in a certain direction. However, the beam width of general vehicle-mounted millimeter-wave radar antennas is generally less than 90 degrees, which cannot meet the requirements of large-angle monitoring at the rear and side.

[0006] Today's on-board millimeter-wave radar antennas generally shape multiple transmitting antennas and receiving antennas by adjusting the amplitude and phase of the power divider to change the beam pointing of the antenna array. This leads to the problem of complex antenna array structure and large area, which also directly leads to the large size and high processing cost of on-board millimeter-wave radars. Therefore, if a single antenna array can replace the functions of multiple antenna arrays, it will be an important breakthrough in the miniaturization and low cost of on-board millimeter-wave radars. Summary of the invention

[0007] In order to solve the problem in the prior art that the vehicle-mounted millimeter-wave radar antenna shapes multiple transmitting antennas and receiving antennas by adjusting the amplitude and phase of the power divider to change the beam pointing of the antenna array, resulting in a complex antenna array structure and a large area, the embodiment of the utility model provides a wide bandwidth beam antenna and a vehicle-mounted millimeter-wave radar.

[0008] According to an object of an embodiment of the utility model, a wide bandwidth beam antenna is provided, comprising: a first feeder, a plurality of radiators and a plurality of parasitic radiators, wherein the plurality of radiators are distributed on both sides of the first feeder along an extension direction of the first feeder and are connected to the first feeder, the plurality of parasitic radiators are arranged on a first side or a second side of the first feeder, and each of the parasitic radiators is respectively located on one side of a radiator on the same side as the first feeder.

[0009] In some optional implementations, the lengths of the plurality of radiators located on the first side of the first feeder are the same, and the widths of the plurality of radiators located on the first side of the first feeder gradually decrease from the middle to both sides;

[0010] and / or, the lengths of the plurality of radiators located on the second side of the first feeder are the same, and the widths of the plurality of radiators located on the second side of the first feeder gradually decrease from the middle to both sides;

[0011] The width direction of the radiator is parallel to the extension direction of the first feeder, and the length direction of the radiator is perpendicular to the extension direction of the first feeder.

[0012] In some optional implementations, the lengths of the multiple parasitic radiators are the same, and the widths of the multiple parasitic radiators gradually decrease from the middle to both sides, wherein the width direction of the parasitic radiator is parallel to the extension direction of the first feeder line, and the length direction of the parasitic radiator is perpendicular to the extension direction of the first feeder line.

[0013] In some optional implementations, the parasitic radiator is disposed on a side of the radiator away from the first feeder.

[0014] In some optional implementations, the width of the parasitic radiator is less than or equal to the width of the corresponding radiator.

[0015] In some optional implementations, the length of the parasitic radiator is set to 0.4-0.5 medium wavelength.

[0016] In some optional implementations, the lengths of the first feeder between two adjacent radiators located on the first side of the first feeder are the same or different;

[0017] And / or, the lengths of the first feeder line between two adjacent radiators located on the second side of the first feeder line are the same or different.

[0018] In some optional implementations, the lengths of the first feed lines between two adjacent radiators are the same or different.

[0019] In some optional implementations, one end of the first feeder is sequentially connected to a matching structure, an impedance transformation structure, and a second feeder.

[0020] According to another purpose of an embodiment of the utility model, a vehicle-mounted millimeter-wave radar is provided, characterized in that it includes the wide bandwidth beam antenna described above.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] The wide bandwidth beam antenna provided by the utility model forms an antenna array by arranging a first feed line, multiple radiators and multiple parasitic radiators in the same plane to facilitate manufacturing and reduce processing costs. In addition, by optimizing the number of radiators, adjusting the length of the first feed line between two adjacent radiators and the width of the radiator, a single antenna array is used to achieve shaping, thereby greatly reducing the size of the wide bandwidth beam antenna.

[0023] In addition, the millimeter wave radar provided by the utility model adopts the wide bandwidth beam antenna, which adjusts the input phase of each radiator by adjusting the length of the first feeder between two adjacent radiators, adjusts the sidelobe level of the wide bandwidth beam antenna by adjusting the width of the radiator, and then adjusts the input amplitude of the radiator in combination with the added parasitic radiator, thereby adjusting the beam pointing and beam width of the wide bandwidth beam antenna, thereby increasing the detection distance and ranging resolution of the millimeter wave radar. At the same time, a single wide bandwidth beam antenna can realize beam shaping, greatly reducing the size and processing cost of the wide bandwidth beam antenna, further reducing the size of the vehicle-mounted millimeter wave radar, and making the vehicle-mounted millimeter wave radar more miniaturized.

[0024] The above description is only an overview of the technical solution of the embodiment of the utility model. In order to more clearly understand the technical means of the embodiment of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are only used to illustrate the embodiments and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0026] Figure 1 A schematic diagram of the structure of a wide bandwidth beam antenna provided by an embodiment of the utility model is shown;

[0027] Figure 2 A simulated reflection coefficient diagram of a wide bandwidth beam antenna provided by an embodiment of the utility model is shown;

[0028] Figure 3 The horizontal plane radiation pattern of a wide bandwidth beam antenna provided by an embodiment of the utility model is shown;

[0029] Figure 4 The vertical plane radiation pattern of a wide bandwidth beam antenna provided by an embodiment of the utility model is shown.

[0030] Among them, 1. a first feed line, 2. a radiator, 3. a parasitic radiator, 4. a matching structure, 5. an impedance transformation structure, and 6. a second feed line. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] In order to solve the problem in the prior art that the vehicle-mounted millimeter-wave radar antenna shapes multiple transmitting antennas and receiving antennas by adjusting the amplitude and phase of the power divider to change the beam pointing of the antenna array, resulting in a complex antenna array structure and a large area, this embodiment provides a wide bandwidth beam antenna.

[0035] This embodiment provides a wide bandwidth beam antenna, such as Figure 1 As shown, it includes: a first feeder 1, multiple radiators 2 and multiple parasitic radiators 3, the multiple radiators 2 are distributed on both sides of the first feeder 1 along the extension direction of the first feeder 1 and are connected to the first feeder 1, the multiple parasitic radiators 3 are arranged on the first side or the second side of the first feeder 1, and each parasitic radiator 3 is respectively located on one side of a radiator 2 on the same side as the first feeder 1.

[0036] In some optional embodiments, the parasitic radiator 3 is disposed on a side of the radiator 2 away from the first feeder 1 .

[0037] In addition, the wide bandwidth beam antenna provided in this embodiment further includes a matching structure 4, an impedance transformation structure 5 and a second feeder 6, and one end of the first feeder 1 is connected to the matching structure 4, the impedance transformation structure 5 and the second feeder 6 in sequence.

[0038] The first feeder line 1 adopts a microstrip transmission line, the impedance transformation structure 5 adopts a 1 / 4 wavelength impedance transformation structure, and the second feeder line 6 adopts a 50 ohm feeder line.

[0039] Specifically, one end of the first feeder line 1 is connected to the matching structure 4 , the other end of the matching structure 4 is connected to the impedance transformation structure 5 , and the other end of the impedance transformation structure 5 is connected to the second feeder line 6 .

[0040] The wide bandwidth beam antenna provided in this embodiment forms an antenna array by arranging a first feed line 1, multiple radiators 2, multiple parasitic radiators 3, a matching structure 4 and an impedance transformation structure 5 on the same plane, so as to facilitate manufacturing and reduce processing costs.

[0041] Example 2

[0042] This embodiment provides a wide bandwidth beam antenna, which is structurally optimized based on the first embodiment.

[0043] In this embodiment as a preferred embodiment, the number of radiators 2 arranged on the first side and the second side of the first feeder 1 can be the same or different, and beamforming can be achieved by using a single wide bandwidth beam antenna according to the number of adjustable radiators 2.

[0044] In this embodiment, which is a preferred embodiment, the lengths of the multiple radiators 2 located on the first side of the first feeder 1 are the same, and the widths of the multiple radiators 2 located on the first side of the first feeder 1 gradually decrease from the middle to both sides.

[0045] and / or, the lengths of the multiple radiators 2 located on the second side of the first feeder line 1 are the same, and the widths of the multiple radiators 2 located on the second side of the first feeder line 1 gradually decrease from the middle to both sides;

[0046] The width direction of the radiator 2 is parallel to the extension direction of the first feeder line 1 , and the length direction of the radiator 2 is perpendicular to the extension direction of the first feeder line 1 .

[0047] In addition, in some optional embodiments, it can also be designed that: the lengths of the multiple radiators 2 of the wide bandwidth beam antenna are the same, and the widths of the multiple radiators 2 gradually decrease from the middle to both sides.

[0048] Similarly, the lengths of the first feeder line 1 between two adjacent radiators 2 on the first side of the first feeder line 1 are the same or different;

[0049] And / or, the lengths of the first feeder line 1 between two adjacent radiators 2 located on the second side of the first feeder line 1 are the same or different.

[0050] In addition, in some optional embodiments, it can also be designed that the lengths of the first feeder lines 1 between two adjacent radiators 2 of the wide bandwidth beam antenna are the same or different.

[0051] At the same time, in this embodiment, the lengths of the multiple parasitic radiators 3 are the same, and the widths of the multiple parasitic radiators 3 gradually decrease from the middle to both sides, wherein the width direction of the parasitic radiator 3 is parallel to the extension direction of the first feeder 1, and the length direction of the parasitic radiator 3 is perpendicular to the extension direction of the first feeder 1.

[0052] In some optional embodiments, the width of the parasitic radiator 3 is less than or equal to the width of the corresponding radiator 2; and the length of the parasitic radiator 3 is set to 0.4-0.5 medium wavelength.

[0053] The wide bandwidth beam antenna provided in this embodiment optimizes the number of radiators 2, adjusts the length of the first feed line 1 between two adjacent radiators 2 and the width of the radiator 2, and uses a single wide bandwidth beam antenna to achieve shaping, thereby greatly reducing the size of the wide bandwidth beam antenna.

[0054] Specifically, the wide bandwidth beam antenna provided in this embodiment adjusts the length of the first feeder 1 between two adjacent radiators 2, and determines the input phase of each radiator 2 according to the length of the first feeder 1 between two adjacent radiators 2. The width of the radiator 2 is adjusted, and the sidelobe level of the wide bandwidth beam antenna is determined according to the width of the radiator 2. The input amplitude of the radiator 2 is determined in combination with the parasitic radiator 3, and then the beam direction of the wide bandwidth beam antenna is determined.

[0055] The wide bandwidth beam antenna provided in this embodiment can also be understood as: the input phase of each radiator 2 can be adjusted by adjusting the length of the first feeder line 1 between two adjacent radiators 2, the sidelobe level of the wide bandwidth beam antenna can be adjusted by adjusting the width of the radiator 2, and the input amplitude of the radiator 2 is determined in combination with the parasitic radiator 3, and then the beam pointing of the wide bandwidth beam antenna is adjusted, so as to achieve the expected radiation pattern, thereby increasing the detection distance and ranging resolution of the wide bandwidth beam antenna.

[0056] For example, Figure 2 The simulation reflection coefficient diagram of the wide bandwidth beam antenna shown in FIG. 1 shows that the wide bandwidth beam antenna has good impedance matching, with a -8dB impedance bandwidth of 76GHz-81GHz and a -10dB impedance bandwidth of 76.2GHz-80.5GHz. The bandwidth of the wide bandwidth beam antenna can cover 76-80GHz, meeting the broadband design of the wide bandwidth beam antenna and greatly improving its ranging resolution. Figure 3 The horizontal plane radiation pattern of the wide bandwidth beam antenna shown in FIG. 1 has a maximum gain of about 13 dB and a maximum beam pointing angle of -50 degrees. The wide bandwidth beam antenna has a 0 dB gain beam width angle of -100° to 100° and a beam width of 200 degrees. Figure 4 The vertical plane radiation pattern of the wide bandwidth beam antenna shown in the figure has a maximum gain of about 9Db, a maximum beam pointing of 0 degrees, a 3dB beam width of 16 degrees, and a first null coverage angle of -20°-20°. The beam width is ±20°.

[0057] Example 3

[0058] This embodiment discloses a vehicle-mounted millimeter-wave radar, including the wide bandwidth beam antenna described in the above-mentioned embodiment 1.

[0059] Moreover, the vehicle-mounted millimeter-wave radar only uses the wide bandwidth beam antenna described in Example 1 to achieve shaping, which greatly reduces the size of the vehicle-mounted millimeter-wave radar, thereby making the vehicle-mounted millimeter-wave radar more miniaturized and saving production costs.

[0060] The vehicle-mounted millimeter-wave radar can be used in intelligent driving systems. For example, as a vehicle millimeter-wave corner radar, it can meet the requirements of a larger FOV (field of view) in the azimuth plane while providing a more stable gain change and a larger detection distance in a smaller size.

[0061] In addition, the vehicle-mounted millimeter-wave radar using the wide bandwidth beam antenna described in the above-mentioned embodiment 1 improves its gain on the side front or rear of the vehicle body, and increases the detection distance of the vehicle-mounted millimeter-wave radar on the side front or rear of the vehicle body. The bandwidth of the vehicle-mounted millimeter-wave radar can cover 76-80GHz, which meets the broadband design of the vehicle-mounted millimeter-wave radar and greatly improves the ranging resolution of the vehicle-mounted millimeter-wave radar.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0064] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0065] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A wide bandwidth beam antenna, characterized in that: include: A first feeder (1), a plurality of radiators (2) and a plurality of parasitic radiators (3), wherein the plurality of radiators (2) are distributed on both sides of the first feeder (1) along an extension direction of the first feeder (1) and are connected to the first feeder (1), and the plurality of parasitic radiators (3) are arranged on a first side or a second side of the first feeder (1), and each of the parasitic radiators (3) is located on one side of a radiator (2) on the same side as the first feeder.

2. The wide bandwidth beam antenna according to claim 1, characterized in that: The lengths of the plurality of radiators (2) located on the first side of the first feeder (1) are the same, and the widths of the plurality of radiators (2) located on the first side of the first feeder (1) gradually decrease from the middle to both sides; and / or, the lengths of the plurality of radiators (2) located on the second side of the first feeder (1) are the same, and the widths of the plurality of radiators (2) located on the second side of the first feeder (1) gradually decrease from the middle to both sides; The width direction of the radiator (2) is parallel to the extension direction of the first feeder (1), and the length direction of the radiator (2) is perpendicular to the extension direction of the first feeder (1).

3. The wide bandwidth beam antenna according to claim 1, characterized in that: The lengths of the plurality of parasitic radiators (3) are the same, and the widths of the plurality of parasitic radiators (3) gradually decrease from the middle to both sides, wherein the width direction of the parasitic radiator (3) is parallel to the extension direction of the first feeder (1), and the length direction of the parasitic radiator (3) is perpendicular to the extension direction of the first feeder (1).

4. The wide bandwidth beam antenna according to claim 1, characterized in that: The parasitic radiator (3) is arranged on a side of the radiator (2) away from the first feeder (1).

5. The wide bandwidth beam antenna according to claim 1, characterized in that: The width of the parasitic radiator (3) is less than or equal to the width of the corresponding radiator (2).

6. The wide bandwidth beam antenna according to claim 1, characterized in that: The length of the parasitic radiator (3) is set to 0.4-0.5 medium wavelength.

7. The wide bandwidth beam antenna according to claim 1, characterized in that: The lengths of the first feeder (1) between two adjacent radiators (2) located on the first side of the first feeder (1) are the same or different; And / or, the lengths of the first feeder line (1) between two adjacent radiators (2) located on the second side of the first feeder line (1) are the same or different.

8. The wide bandwidth beam antenna according to claim 1, characterized in that: The lengths of the first feeder lines (1) between two adjacent radiators (2) are the same or different.

9. The wide bandwidth beam antenna according to claim 1, characterized in that: One end of the first feeder line (1) is sequentially connected to a matching structure (4), an impedance transformation structure (5) and a second feeder line (6).

10. A vehicle-mounted millimeter wave radar, characterized in that: The invention comprises the wide bandwidth beam antenna as described in any one of claims 1 to 9.

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